[Amezarak]

Democracy didn’t stop the Athenians from exterminating the Melians, every adult male being killed and the rest of the population sold into slavery, all because (according to Thucydides), “the strong do what they can and the weak suffer what they must.”

[TheCoelacanth]

Athenians weren't really democratic by modern standards. Only about 10% the population could vote[1].

[1] https://en.wikipedia.org/wiki/Athenian_democracy